[bch-nvm-pages v10 6/6] bcache: get allocated pages from specific owner

[Qiaowei Ren <qiaowei.ren@xxxxxxxxx>]

From: Jianpeng Ma <jianpeng.ma@xxxxxxxxx>

This patch implements bch_get_allocated_pages() of the buddy to be used to
get allocated pages from specific owner.

Signed-off-by: Jianpeng Ma <jianpeng.ma@xxxxxxxxx>
Co-developed-by: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
Signed-off-by: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
---
 drivers/md/bcache/nvm-pages.c | 6 ++++++
 drivers/md/bcache/nvm-pages.h | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index 755f3727a468..4f7fde0286a3 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -395,6 +395,12 @@ void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 }
 EXPORT_SYMBOL_GPL(bch_nvm_alloc_pages);
 
+struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid)
+{
+	return find_owner_head(owner_uuid, false);
+}
+EXPORT_SYMBOL_GPL(bch_get_allocated_pages);
+
 #define BCH_PGOFF_TO_KVADDR(pgoff) ((void *)((unsigned long)pgoff << PAGE_SHIFT))
 
 static int init_owner_info(struct bch_nvm_namespace *ns)
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index 918aee6a9afc..cfb3e8ef01ee 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -64,6 +64,7 @@ int bch_nvm_init(void);
 void bch_nvm_exit(void);
 void *bch_nvm_alloc_pages(int order, const char *owner_uuid);
 void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid);
+struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid);
 
 #else
 
@@ -81,6 +82,10 @@ static inline void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
 	return NULL;
 }
 static inline void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid) { }
+static inline struct bch_nvm_pages_owner_head *bch_get_allocated_pages(const char *owner_uuid)
+{
+	return NULL;
+}
 
 #endif /* CONFIG_BCACHE_NVM_PAGES */
 
-- 
2.25.1